package c02;

import java.util.Scanner;

public class Xiexie7 {
    public static void main(String[] args) {
       // int grade = 75;
        Scanner scl = new Scanner(System.in);
        int grade = scl.nextInt();

        if (grade > 80){
            System.out.println("该成绩的等级为优");
        } else if (grade > 70){
            System.out.println("该成绩的等级为良");
        } else if (grade > 60){
            System.out.println("该成绩的等级为中");
            }else{
            System.out.println("该成绩的等级为差");
        }
    }
}
